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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '111b1b73206f8e3b7064863c6d07e9e03e7242eac1376f675395f84ca0f8a690' 
  AND token = 'Dak8cCEkH4W53xVvu+ISwvaz6saeQNM2cGHzmEILiAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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