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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c924881529e540f156e19c93442736f5a15a0bfe09c585833734c215a5c249bc' 
  AND token = 'x0nRfWPe+mvjZE9415gcc+6F86f1YaX81VpBurM8E8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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