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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb121dadfd639491c35dceca9cb54040cff3d52773c9cc1c1fbe12f25d7bcc66' 
  AND token = 'CTyM7dVg0GqPkLLlWTcqju2YPET4KNn6MIB5y4D1GF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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