SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460e8de9214bc0f907863adfb7f4ab00bf859f16696580514cfbe0e1fda33d2f' 
  AND token = 'mhGw8cMIuUKqd0Gz9gN0PjkXFGXkw287VFgBlrUZFik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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