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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b41616772a7ecf47d7955347b333a5e94e1c9b4afcb7fa660db190fb453c7f' 
  AND token = '5T07pEG2Ct7W6yI3JSgrmAfkpvhjHYU2e7DBesJPKeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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