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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6cf95436c71a7b7d8afa33fe025b6d49646e56f831cfc06ff0bcf0b8e38e44' 
  AND token = 'YeLkH3GYOhkuBvqfpKQtzteaVdyQnAljBsnOj2k2K24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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