SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364d7cf1f11228f874f03ff9a38b4fcb8ee154852e51ae53f909df539c0e6cd1' 
  AND token = 'r+cik99Q8psYNBz+qZvPfIzj+uw09EGdSDOpbAmGFOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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