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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0760f4663ac96ab871a000ba838bc517a7126e3ed84399d9f2ca58ebce7a99' 
  AND token = 'Ai6Aw96Oj2n6X7pfFrTI90H7w3hIXHcfsXbVYLKNXNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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