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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb067c16757eaab58d9f3c28d00408d8c9d618c42f5a18d020816a65ca4e5b1' 
  AND token = 'eet6BgJjie0XNfhB4iKAwoapydtawoEdAca7hUzHDLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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