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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d4f5a5d95b60adf0ef0ed584fc9b71d081c3f8e12be58ad83e6e9e8d91deabb' 
  AND token = 'i6e6lOEWObBT62uSwGQR4OwZoyk5y5e7cIYYgfCRsQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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