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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18b7752ae071d6b01be410a1f7b90aabd082f93d38bc584bea500a963c6e6ef' 
  AND token = 'TK02/X8op2QKOwtoTbEpW03JyO99X4yo/eKFCRUqjJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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