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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6573001c443a760e8f6ac9fc016689e9b8fb2f702ad0e604caf75e1613df28' 
  AND token = '1Ga5KGISKC+55caa+kp8n7ZP9FSstyBwBrHYvIy6WNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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