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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f956492f2c33f47345ca382073957bd9e980d74dc99eeacd42b68e3cb528c0e1' 
  AND token = 'jkREU9XFEpMDPCA4mO3/jVWd1T1ScEjqBcDL/BoiU2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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