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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '387ffa6ae4d682d564898414bf9f0a8c53eb190a51053a48722f0be3d8e74d88' 
  AND token = '2N5iQ9I6KVHiUePm2ob9HV3Egt+Kl6CBgoTN/YL6P04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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