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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1290fe9ece11465abf09a9a7682e7ddfecc1d8e1fa28e642df70aec83c9cd1' 
  AND token = '6wR6ARPjtuA0Om5bp16wmJ0QXGCo688aPqzuqjagN3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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