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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a17ee789058709177a4febd80e6dbf3b141b5ccb455f04346f4c269bd93bc34' 
  AND token = 'YWQjylNk8drS/eWEtyEcEBXNpUB4TWD8+9p80n+wATg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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