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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '588b5fc00aca8e598b8ace12729638785eb47c5311934ee6da0a98434d2a8832' 
  AND token = 'kel7NYbm1eK4dfvo1BmaxyXBRwPX3HN1UKzTXu4gO6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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