SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c292b1a005eb3a2815ef207175ca9e73941cd8d5d0a664f3bee54c83052dcd' 
  AND token = 'Vh5n2v3RdisJmHICjjPmkFXzgiVKHk4s7/zGwOZte8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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