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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7216c828897acc4ce1d9da92b5acd7ac4ccf2875f0f09d5556828ca982a106' 
  AND token = 'hp5P4CPSJCuoURdijz09Qb4XKK/BvJWTYx0AZe8/TDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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