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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb106033b4fc9f4f88f956ef69a0a3bfb4a22953eaf98c7b48589cf5a0ec0503' 
  AND token = 'grjW0eL4zUlRmePHMgzIDl6IFz8EEd7An5YI4rTN/u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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