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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc686bf7ba347608f743b46aa5ea650d56f558155d94c6f1412787ed16bb00d' 
  AND token = 'Kc76PC39eGZRQ/amYeYuIJMOdlfI37ai0IyjNzScF94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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