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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c872016688248d987720ce6894dde45c61f1d272a61bffb2fa50ab53e840935c' 
  AND token = 'dVR6IZhbiz9GfsvmUdaSw33kk2dUi1wDqP3hs9q+B9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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