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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f603e838a7b2eb510679f4c3a38c1517717984ec7b317a5961898768d643ec' 
  AND token = 'AjlUP+Agvp30p9akfm9FZbKDIS1ywjC1+Loho6gCyxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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