SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438b12a5f814933d23734fc0b76b1617e2a9cf114b2ed5f8ad3d67188db87a5d' 
  AND token = 'GmLfV3I3dFYxyGlnMuVuJIjt/aNyg+T0VgQb7QKRt+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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