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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '761e817f4b606c7800eb50d604a53d16025df8fd03ac5458f5cebe4464f454de' 
  AND token = 'zmmVlK+Am/YnBNgi4gE8+QT8RlLsklkmod2hoRfXNos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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