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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58991481ec993db8b090605e6314b16f88963cd095323a07db239bbe34b1c0b5' 
  AND token = 'pO3Xwe0iaPjb8fL4qcLo5dwhBzSQQMC/ovktwZUc1pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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