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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f084a5b67199b1d5132288668333dbd994ba9ee04f0e28c854e40f635468c6' 
  AND token = '4MFAbwukx456XDJNtkPHoS/4M8yHeHZaZdUt4ZB49U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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