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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1ae12442e9ee73daa4ddbc507cebe2102bec0ca058733e10df8a3a4ab16bf0' 
  AND token = 'K031EVxUJ6qPtXqMi+fEIQM+23KMHLyRYb0NA0GqybU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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