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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c28122380846bcd4ca5ea56f909b3b64f68b75b347d582cd8c01e3674886b1' 
  AND token = '2v/zy9HZSq0aBw7LcBI1BtJWwfg7ZNryQZp8z92EVIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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