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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c15da63ff6aa0ca6a2a12abb23739cd6f645982dab207dbf27881b0eda48c7' 
  AND token = 'nZoKLoBj7M3kC0BzEp+XsomBxOMJWyzQEojvP7T0jEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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