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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09421cb990f101dc1f949e52b6ae6675d373302b9d0226abf1b110d7c9828e4' 
  AND token = 's9WxcJFmgYjjaG78ibuJopm9MLgEJq6teopXuMK/luE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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