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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8841201fadfda204dbf0cfa6cb21e1b11415586df318213a613ac1587e4c7a' 
  AND token = 'rOwxCNVN0w4/xJdJu9A/l8kJjGXCTG1s3GWBKauA2os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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