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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4a933cc16e38db4540b1c8e7a5d87820315910f088a7d471cc5870160c7e8c' 
  AND token = '4LKjxJWkjPpehbM5K6trjkU12z5erogBzNFf8Bqx15c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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