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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0dca8f6dcbdb4d9d9674009a198fb6fce15c205306e69afc69ca918876cc256' 
  AND token = 'uIfhzIgogNT8LKMiKDGreEav2jhPc+S1KkSCByoq2Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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