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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e384a0b872da5d9c74b797b4dfe24e45167072248e0e521c15e40f9d6762a88' 
  AND token = 'WKxH+j6oOnEtmJrIJBlcoTvyQ6TyofGKhnqoq/etJDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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