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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb8b6749350f8fd036b29d8fc2319666e0b6f26073c82da28063e313b38a91c' 
  AND token = 'gTPdG1MD1UlWlW9HPflHVEWMUM1O0hDbshB2DDx7Ew0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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