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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b580ae59fa6fbbe249c56c5b8eca5f2290da3aa49ea0f1d8734bf69cd032eea' 
  AND token = 'InvJdfN7LBH21FKYN01QDZ1KhgvcNisoUOhVdrU/7T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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