SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a39f8c3c10e887f24ac2e25fb6d272b0c703090727fb9805184b541621e0b3' 
  AND token = 'bo5FjSadGTKOzYfUEQ9mPVtZsU+VwAWJWGYKsCZkA18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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