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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b15622d71a4479f3a87d113fc7c9e2ad1c1dbaf1b995daa6aef175bd447e134' 
  AND token = '57vUPIyno2eIYAqnGNTrb8SWnCONYguRolBExJlO5gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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