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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207f456524eec4562939975ef98f7cff40185d7926be706aaa0713b5320c16e8' 
  AND token = 'hyFkiW8yrZ1M5S/RwUngpmyyhdjVOs3MFHcITlPs7+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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