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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9b443e3eea4812d039acdb2cd1e1e47f0b11eef89acc90221f544375c014f8' 
  AND token = 'mY2sORLpkMs+bSGMi21nU8VOdfBXJ9VBKutt+CL+O/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}