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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7cb54e05c6a097a693bd1a6d2b7fafcf40aca1aab57a36816342a782a572f2' 
  AND token = '3hDW2zK2d6m59SXhoZ+jtSTrJ6Xl04HUMM8mzvtAmDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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