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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba1a94e7d96e8dc0c5f1c9321d67894342e7a6ea7d90f0a3b9cdd4c4c490eb1' 
  AND token = 'a0oo3XDkvB+5+O21WuQglz10y6jXYtiLojFjoTeLEsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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